Two-Part Urethane Adhesive Strength Development via Low MW Polyol
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Solution Overview
Problem
The existing two-part curable urethane adhesive compositions face challenges in achieving optimal strength development and adhesiveness, particularly after four hours of mixing, when used with resin materials.
Innovation Solution
A two-part curable urethane adhesive composition is developed, incorporating a main agent with a urethane prepolymer and a curing agent containing a tri- or higher functional polyol compound with a molecular weight of 1000 or less, along with a terpene oligomer, which enhances the strength development property and adhesiveness without the need for a primer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a two-part curable urethane adhesive composition is used to bond resin materials, then adhesiveness is improved, but strength development property after four hours is insufficient
Solution Approach 1:
The patent changes the molecular weight parameter of the polyol compound to 1000 or less and specifies functional groups (tri- or higher functional polyol) to accelerate the curing reaction kinetics, thereby improving strength development within four hours while maintaining final adhesive strength
Solution Approach 2:
The patent creates a composite curing system by combining a tri- or higher functional polyol compound with a terpene compound, where the polyol provides rapid initial curing for strength development and the terpene compound contributes to final adhesive performance and flexibility
2Strength
If a primer is used to adhere resin materials with dissimilar materials, then adhesiveness is improved, but environmental harm increases due to solvent content
Solution Approach 1:
The patent extracts and eliminates the primer layer from the adhesive system, using the two-part curable urethane adhesive composition directly to bond resin materials to dissimilar materials, thereby removing the source of solvent-related environmental harm while maintaining bonding performance
Solution Approach 2:
The urethane prepolymer acts as an intermediary substance that provides both adhesion to the resin material surface and compatibility with the curing agent, enabling direct bonding without a separate primer layer while maintaining strong adhesive bonds
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition exhibits excellent strength development and adhesiveness to dissimilar materials like glass and resin, metal and glass, and metal and resin, without using a primer, demonstrating improved performance in both initial adhesion and durability through cooling and heating cycles.
Implementation Method 1
a main agent (A) containing a urethane prepolymer (a); and a curing agent (B) containing a compound having two or more active hydrogen groups per molecule (b)
Implementation Method 2
one or both of the main agent (A) and the curing agent (B) further contain a terpene oligomer (x)
Data Source
AI summary
The present invention provides a two-part curable urethane adhesive composition including: a main agent (A) containing a urethane prepolymer (a); and a curing agent (B) containing a compound having two or more active hydrogen groups per molecule (b); wherein the compound having active hydrogen groups (b) includes a tri- or higher functional polyol compound with a molecular weight of 1000 or less (b1); and one or both of the main agent (A) and the curing agent (B) further contain a terpene oligomer (x).